基于太赫兹时域光谱的SBN:Ce陶瓷介电的光调制特性
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天津大学精密仪器与光电子工程学院,超快激光研究室,天津大学精密仪器与光电子工程学院,超快激光研究室,天津大学精密仪器与光电子工程学院,超快激光研究室,天津大学精密仪器与光电子工程学院,超快激光研究室,天津大学精密仪器与光电子工程学院,超快激光研究室,天津大学精密仪器与光电子工程学院,太赫兹中心,天津大学精密仪器与光电子工程学院,太赫兹中心,天津大学精密仪器与光电子工程学院,太赫兹中心

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国家重点基础研究发展计划(973计划);国家自然科学基金项目(面上项目,重点项目,重大项目)


Laser modulation dielectric properties of SBN:Ce ceremics using the Terahertz Time-Domain Spectroscopy
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Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Ultrafast Laser Laboratory,Key Laboratory of Optoelectronic Information Technology of Ministry of Education,College of Precision Instrument and Optoelectronics Engineering,Tianjin University

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    摘要:

    在室温条件下,基于太赫兹时域频谱(THz-TDS)技术研究了SBN:Ce陶瓷在532 nm连续激光激发下的介电响应.在外加光场的作用下,该陶瓷的介电常数表现出良好的调制特性,介电改变量达到8.5%;同时,介电损耗增加了15%.实验结果表明,该材料折射率的变化|Δn|与外加光场强度呈现线性关系.通过建立模型,分析了SBN:Ce陶瓷的光-铁电机理,这些实验结果可以被归结为,激发的自由载流子在样品内部形成的内建电场导致的介电常数改变.探索铁电陶瓷材料在太赫兹波段的光-铁电性质对于太赫兹波调制器件的研究具有指导意义.

    Abstract:

    The dielectric response of SBN:Ce ceremics modulating by the 532nm cw laser is investigated at room temperature by means of a terahertz time-domain spectroscopy. When the external laser field is imposed onto the SBN:Ce ceremics, the permittivity of the sample shows an appreciable modulation results, which the modulation depth reach up to 8.5% and the dielectric loss increases 15%, respectively. The experimental results show there is a linear dependency between the variation of refractive index |Δn| and the applied laser intensity. The photo-ferroelectric physical mechanisms of SBN:Ce ceramics can be attributed to the internal space field in the ceramics caused by the light excited free carries with the analytic models. The conclusion presents important references for design and selection of the teraherz tunable devices.

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陈立伟,柴路,栗岩锋,胡明列,王清月,田震,韩家广,张伟力.基于太赫兹时域光谱的SBN:Ce陶瓷介电的光调制特性[J].红外与毫米波学报,2015,34(5):564~569]. CHEN Li-Wei, CHAI Lu, LI Yan-Feng, HU Ming-Lie, WANG Qing-Yue, TIAN Zhen, HAN Jia-Guang, ZHANG Wei-Li. Laser modulation dielectric properties of SBN:Ce ceremics using the Terahertz Time-Domain Spectroscopy[J]. J. Infrared Millim. Waves,2015,34(5):564~569.]

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  • 收稿日期:2014-08-10
  • 最后修改日期:2014-11-06
  • 录用日期:2014-12-05
  • 在线发布日期: 2015-11-30
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